Patent application number | Description | Published |
20080283170 | Heavy-load tire - A heavy-load tire has a wind bead structure in which a turned-up portion of a carcass ply is wound around a bead core, in which a bead portion is equipped with a bead reinforcing layer having a U-shaped cross section and a bead apex rubber having a triangular-shaped cross section. The turned-up portion has an auxiliary turned-up portion passing through the vicinity of a radially outer side of the bead core. The bead apex rubber includes a high elasticity inner apex portion disposed at a radially inner side and a low elasticity outer apex portion disposed at a radially outer side. The inner apex portion has an L-shaped cross section including a bottom piece portion along the radially outer side of the auxiliary turned-up portion, and a raised piece portion which rises at an axially inner end side of the bottom piece portion and extends radially outwardly in a tapering manner along the body portion of the carcass ply. | 11-20-2008 |
20090056851 | Heavy duty tire - A heavy duty tire comprises: a bead filler disposed radially outside a bead core and axially outside a carcass main portion; a bead-reinforcing layer made of steel cords; and a chafer made of a rubber extending along the bead bottom surface. The chafer rubber has a complex elastic modulus in a range of 8 to 12 MPa and a 100% modulus in a range of 4.0 to 5.5 MPa. In the bead-reinforcing layer, the steel cord count is 25 to 40/5 cm, the steel cord diameter is 0.8 to 1.2 mm, and the cord angle is 30 to 60 degrees with respect to the tire radial direction. The bead filler comprises a main filler made of a low modulus rubber and a fastening filler made of a high modulus rubber. The fastening filler has an L-shaped cross sectional shape and comprises an axially-extending base portion and a radially-extending axially inner portion. The main filler has a part wedged between the base portion and axially inner portion of the fastening filler. | 03-05-2009 |
20090294011 | HEAVY-DUTY PNEUMATIC TIRE - A heavy-duty pneumatic tire comprises: a carcass ply turned up around a bead core in each bead portion from the inside to the outside of the tire so as to have a pair of turnup portions and a main portion therebetween; and a bead apex and an L-shaped reinforcing cord layer which are disposed in each of the bead portions. The bead apex includes: an L-shaped high-modulus inner bead apex; and a delta-shaped low-modulus outer bead apex. The L-shaped inner bead apex comprises: a base part along a radially outer surface of the bead core; and a radial part along the carcass ply main portion. The delta-shaped outer bead apex is disposed on the radially outside of the base part of the L-shaped inner bead apex and on the axially outside of the radial part of the L-shaped inner bead apex. The L-shaped reinforcing cord layer is made up of an radially inner part extending on the radially inner side of the bead core, and an radially outer part extending along the axially outer surface of the carcass ply turnup portion. | 12-03-2009 |
20100084069 | HEAVY DUTY TIRE - A heavy duty tire comprises a belt disposed radially outside a carcass in the tread portion, and a belt cushion rubber layer inserted between the carcass and each axial edge portion of the belt. The complex elastic modulus of the belt cushion rubber layer is in a range of from 3.5 to 4.5 MPa. The belt is made up of three plies each made of parallel steel cords inclined at an angle of from 15 to 23 degrees with respect to the tire equator. With respect to the tire equator, the inclination of the belt cords of the radially innermost first ply is opposite to that of the middle second belt ply. The second belt ply is narrower than the first belt ply and wider than the radially outermost third belt ply. The ply strengths S | 04-08-2010 |
20100224300 | HEAVY-LOAD RADIAL TIRE - A heavy-load radial tire includes a bead apex rubber | 09-09-2010 |
20100269967 | HEAVY DUTY RADIAL TIRE - A heavy duty radial tire comprises a tread portion divided into four or five circumferential ribs and a tread reinforcing belt including a maximum width belt ply. The width Bw of the maximum width belt ply is 0.90 to 0.98 times the tread width Tw. The contour shape of the tire footprint has a ground contacting length CB at a 70% width position and a ground contacting length CC at a 97% width position, wherein the ratio CB/CC is 1.00 to 1.06. In a tread edge near region J, (1) the axially outermost shoulder rib is provided with no circumferential groove having a width of less than 5 mm, and a ratio Rs/Rc of an axial width Rs of the shoulder rib to an axial width Rc of a center rib is 1.25 to 1.45, or (2) the shoulder rib is provided with a narrow circumferential groove having a width of less than 5 mm to divide the shoulder rib into an axially inner main portion and an axially outer narrow portion, and a ratio Rs | 10-28-2010 |
20110162775 | HEAVY-LOAD TIRE - A heavy-load tire has a wind bead structure in which a turned-up portion of a carcass ply is wound around a bead core, in which a bead portion is equipped with a bead reinforcing layer having a u-shaped cross section and a bead apex rubber having a triangular-shaped cross section. The turned-up portion has an auxiliary turned-up portion passing through the vicinity of a radially outer side of the bead core. The bead apex rubber includes a high elasticity inner apex portion disposed at a radially inner side and a low elasticity outer apex portion disposed at a radially outer side. The inner apex portion has an L-shaped cross section including a bottom piece portion along the radially outer side of the auxiliary turned-up portion, and a raised piece portion which rises at an axially inner end side of the bottom piece portion and extends radially outwardly in a tapering manner along the body portion of the carcass ply. | 07-07-2011 |
20120060995 | HEAVY DUTY TIRE - A heavy duty tire comprises a belt disposed radially outside a carcass. The belt consists of a innermost first ply, a second ply and a outermost third belt ply. With respect to the tire equator, the cords of the first ply are laid at an angle θ | 03-15-2012 |
20130098537 | GREEN TIRE FORMING METHOD AND PNEUMATIC TIRE PRODUCING METHOD - A method includes a tubular carcass with core forming process (K | 04-25-2013 |